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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 5 |
| 3 | 46 |
| 4 | 641 |
| 5 | 11996 |
| 6 | 282907 |
| 7 | 8060242 |
| 8 | 269429729 |
| 9 | 10341367480 |
| 10 | 448317429011 |
| 11 | 21667926214694 |
| 12 | 1155321200076529 |
| 13 | 67370686916807236 |
| 14 | 4265392644606677963 |
| 15 | 291391173322695366106 |
| 16 | 21365209437807863776193 |
| 17 | 1673543873372595900318704 |
[1,1,5,46,641,11996,282907,8060242,269429729, 10341367480,448317429011,21667926214694, 1155321200076529,67370686916807236, 4265392644606677963,291391173322695366106, 21365209437807863776193,1673543873372595900318704] |